The Retina IIa is a folding, 35mm rangefinder camera which was produced over two production runs that occurred before and after WWII. The Type 150 Retina IIa was made between 1939 and 1941. The Type 011 started in 1949 after cessation of WWII and lasted presumably until 1951. And finally, the Type 016 was the last Retina IIa, produced between 1951 and 1954.
Of these three different models, the Type 016 is generally the most sought after of the Retina IIa cameras. This camera introduced lever advance, replacing the earlier knob advance of previous types, and commonly included a fast and high performing Schneider or Rodenstock 50mm f/2 lens.
The Retina IIa does have a bit of a learning curve to it. The camera requires new users to pay close attention to how they use it, but rewards that effort by being an excellent, compact rangefinder camera that fits easily into a pocket.
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Kodak Retina IIa
The Kodak Retinas are an oft over-looked, quality 35mm rangefinder. They are super compact, incredibly engineered, and sport some great optics. Our favorite is the Retina IIIc (big or little C) but this Retina IIa is also a great camera and much less expensive than its successor. It has a 50mm f/2 lens, which is actually impressively fast for a folding, compact camera coming out of the 1950s. All you really miss is the lack of meter, but they've got apps for that.